Filmmaker-photographer couple Julie Winokur and Ed Kashi were busy pursuing their careers and raising two children when Winokur's 83-year-old father, Herbie, became too infirm to care for himself.

At that moment they joined some twenty million other Americans who make up the sandwich generation, those who find themselves responsible for the care of both their children and their aging parents.

Authors of the book "Aging in America: The Years Ahead," which chronicles the country's fastest-growing segment of the population, Winokur and Kashi decided to tell their own story as they took on the care of Winokur's father. In The Sandwich Generation, they have created an honest, intimate account of their own shifting — and challenging — responsibilities, as well as some of their unexpected joys.